blob: 938daf926cf272d9fdb0d2804b5ddba371a041e3 (
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import contextlib
import importlib
import sys
import types
def _is_package(module):
try:
module.__getattribute__('__path__')
except AttributeError:
return False
return True
_NO_ATTRIBUTE = object()
def passthrough_module(parent, child, *, callback=lambda _: None):
parent_module = importlib.import_module(parent)
child_module = importlib.import_module(child, parent)
class PassthroughModule(types.ModuleType):
def __getattr__(self, attr):
if _is_package(parent_module):
with contextlib.suppress(ImportError):
return importlib.import_module(f'.{attr}', parent)
ret = _NO_ATTRIBUTE
with contextlib.suppress(AttributeError):
ret = getattr(child_module, attr)
if _is_package(child_module):
with contextlib.suppress(ImportError):
ret = importlib.import_module(f'.{attr}', child)
if ret is _NO_ATTRIBUTE:
raise AttributeError(f'module {parent} has no attribute {attr}')
callback(attr)
return ret
# Python 3.6 does not have module level __getattr__
# https://peps.python.org/pep-0562/
sys.modules[parent].__class__ = PassthroughModule
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